b) Derive an
expression for the
rate of a reaction in terms of the molar concentration of reactant
A for the
case in which this assumption is not valid.

2. In
biological
systems, certain proteins called enzymes (E) catalyze the reaction
of small molecules called substrates (S) to form the desired
products (P).A
proposed reaction mechanism involves
two elementary steps; 1) one substrate binds to one enzyme in a
slow step to
form an enzyme-substrate complex (ES), and 2) the enzyme-substrate
complex
reacts quickly to form one product.

a) Write the overall reaction and the
elementary reactions
described by this proposed mechanism.

b) Assuming that the steady-state approximation
holds,
determine the rate law for the overall reaction, in terms of the
concentration
of reactants, concentration of products, and any rate constant.

3.Consider
the
following reaction:

Cr(H2O)63+(aq)
+ SCN-(aq) ® Cr(H2O)5(SCN)2+(aq) +
H2O(l)

The following initial rate data were obtained
at 298 K:

[Cr(H2O)63+]0
(mol/L)[SCN-]0
(mol/L)v0
(mol/Ls)

1.21
x 10-41.05
x 10-52.11
x 10-11

1.46
x 10-42.28
x 10-55.53
x 10-11

1.66
x 10-41.02
x 10-52.82
x 10-11

1.83
x 10-43.11
x 10-59.44
x 10-11

Determine the rate law and rate constant for
this
reaction.Assuming
integer
reaction orders.

4.Consider
the
reaction of A to form either product B:

A -->
B

Derive an expression for [A] at any time as a
function of the
initial concentration [A]0 and the rate constant of the
reaction.

5.Suppose
you
could measure the concentration of species A, [A], at any time t
along a reaction.Explain,
in words and figures, how you
would use the integrated rate law you derived in problem 4 to
determine the
rate constant of the reaction.